Portable wireless speaker system



FIG. 1 is front-top-right perspective view of a portable wireless speaker system showing our new design;

FIG. 2 is a front side view thereof;

FIG. 3 is a back side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for a portable wireless speaker system, as shown and described. 